Fifty years after New Zealand had its last case of wild polio the world is on the cusp of eradicating the disease for good. D'Arcy Lunn of the Global Poverty Project talks about The End of Polio Campaign; Otago University associate professor of public health Michael Baker discusses what other contagious diseases could be eradicated by vaccines; and Robert Beaglehole on the ambitious 25 by 25 campaign that aims to cut the number of deaths by non- communicable diseases by 25 percent internationally. Produced by Jeremy Rose.